Erika Nakanojo is a Japanese crew member (doctor) of Annex I, and was placed in Squad 1 led by Shokichi Komachi. Erika came from a poor family. Her parents fell into heavy debt sending her to medical school but kept the news from her. After Erika became a doctor, she found out about the debts in her name, and had to become a doctor for the Annex I project.

After receiving her M.O. operation, Erika gained the abilities of a Schlegel's Japanese Gecko, which gives her toepads that allows her to adhere to most surfaces without the use of liquids or surface tension.